P27AA 2017 Chevrolet Silverado Code - Transmission Control Solenoid Valve 4 Calibration Incorrect
Quick Answer
The Transmission Control Solenoid Valve 1, 2, 3, 4, 5, 6, 7 have a unique current versus oil pressure characteristic that is used to properly upshift or downshift the transmission. Common causes include Solenoid Valve Characterization Reprogramming. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P27AA 2017 Chevrolet Silverado indicates Transmission Control Solenoid Valve 4 Calibration Incorrect.
- Common causes
- Common causes include Solenoid Valve Characterization Reprogramming.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P27AA 2017 Chevrolet Silverado Description
What are the Possible Causes of the DTC P27AA 2017 Chevrolet Silverado?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AA 2017 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P27AA 2017 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P27AA 2017 Chevrolet Silverado Code
1. What does the OBDII code P27AA mean on a 2017 Chevrolet Silverado?
P27AA indicates that the Transmission Control Module (TCM) has detected an incorrect calibration in Transmission Control Solenoid Valve 4.
2. What are the common symptoms of the P27AA code?
Symptoms may include erratic shifting, delayed gear engagement, transmission slipping, or the Check Engine Light being illuminated.
3. What causes the P27AA code to appear?
Common causes include a faulty solenoid valve, incorrect TCM programming, wiring issues, or contamination in the transmission fluid.
4. Can driving with the P27AA code damage my 2017 Chevrolet Silverado?
Yes, prolonged driving with this code can cause further transmission damage or lead to unsafe driving conditions due to erratic shifting.
5. How can I fix the P27AA code on my Silverado?
Repairs may involve reprogramming or updating the TCM, replacing the solenoid valve, inspecting and repairing wiring, or flushing and replacing the transmission fluid.
6. How much does it cost to repair the P27AA code?
Repair costs can vary but typically range from $150 for a TCM reprogram to over $1,000 if a solenoid or other transmission components need replacement.
7. Can low transmission fluid cause the P27AA code?
While low fluid alone is unlikely to directly cause this code, it can lead to solenoid malfunctions or other issues that trigger it.
8. How do I diagnose the P27AA code?
A mechanic will typically use a scan tool to verify the code, inspect the transmission system, check wiring connections, and test the solenoid valve for proper operation.
9. Is P27AA a common issue on the 2017 Chevrolet Silverado?
It is not a common issue but can occur, particularly if the vehicle’s transmission has not been properly maintained.
10. Can a software update fix the P27AA code?
Yes, in some cases, updating or reprogramming the TCM software can resolve the calibration issue without replacing any hardware.
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